This is a McDonald's The Flintstones Pre-Dawn clear glass mug from 1993. It was a promotional item associated with the release of The Flintstones movie. The mug features a textured, tree-trunk design with "The Flintstones" and "RocDonald's" embossed on the side. The handle of the mug is uniquely shaped like a bone. The mugs were part of a set of four different designs released by McDonald's in 1993.